138491551604 has 36 divisors (see below), whose sum is σ = 283193576064. Its totient is φ = 59087344176.

The previous prime is 138491551571. The next prime is 138491551619. The reversal of 138491551604 is 406155194831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1540574 + ... + 1627989.

It is an arithmetic number, because the mean of its divisors is an integer number (7866488224).

Almost surely, 2^138491551604 is an apocalyptic number.

138491551604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138491551604 is an abundant number, since it is smaller than the sum of its proper divisors (144702024460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138491551604 is a wasteful number, since it uses less digits than its factorization.

138491551604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168804 (or 3168795 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 138491551604 in words is "one hundred thirty-eight billion, four hundred ninety-one million, five hundred fifty-one thousand, six hundred four".